Which signal word is associated with Hazard Class I and chemicals that have severe corrosive properties?

The signal word "Danger" is specifically associated with Hazard Class I, which includes chemicals that are classified as having severe corrosive properties. This classification indicates that these substances pose a significant risk of causing severe skin burns, eye damage, or other serious health hazards upon exposure. The usage of "Danger" is intended to alert individuals to the severe nature of the risks involved with handling or being near these chemicals, emphasizing the need for stringent safety measures and protective equipment.

In contrast, the other signal words—such as "Warning," "Caution," and "Notice"—are used for substances that present lesser levels of hazards. "Warning" typically signifies moderate hazards, while "Caution" is meant for chemicals with low hazard levels. "Notice" is not commonly used as a signal word within the context of hazardous materials. Therefore, "Danger" clearly denotes the highest level of caution necessary when working with highly corrosive substances, making it the correct choice in this scenario.